1 /* 2 * Copyright (C) 2015-2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_WORKER_H_ 18 #define ANDROID_WORKER_H_ 19 20 #include <condition_variable> 21 #include <cstdint> 22 #include <cstdlib> 23 #include <mutex> 24 #include <string> 25 #include <thread> 26 27 namespace android { 28 29 class Worker { 30 public: Lock()31 void Lock() { 32 mutex_.lock(); 33 } Unlock()34 void Unlock() { 35 mutex_.unlock(); 36 } 37 Signal()38 void Signal() { 39 cond_.notify_all(); 40 } 41 void Exit(); 42 initialized()43 bool initialized() const { 44 return initialized_; 45 } 46 47 protected: 48 Worker(const char *name, int priority); 49 virtual ~Worker(); 50 51 int InitWorker(); 52 virtual void Routine() = 0; 53 54 /* 55 * Must be called with the lock acquired. max_nanoseconds may be negative to 56 * indicate infinite timeout, otherwise it indicates the maximum time span to 57 * wait for a signal before returning. 58 * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out 59 */ 60 int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1); 61 should_exit()62 bool should_exit() const { 63 return exit_; 64 } 65 66 std::mutex mutex_; 67 std::condition_variable cond_; 68 69 private: 70 void InternalRoutine(); 71 72 std::string name_; 73 int priority_; 74 75 std::unique_ptr<std::thread> thread_; 76 bool exit_; 77 bool initialized_; 78 }; 79 } // namespace android 80 #endif 81